Multiplexing strip and data channels in a time division duplex communication system

1. A communications method, comprising:

generating a strip Orthogonal Frequency Division Multiplexing (OFDM) symbol;

generating non-strip OFDM symbols using a first tone hopping sequence, tone hopping in said non-strip OFDM symbols being independent of said generation of said strip OFDM symbol;

generating a downlink transmission unit of a first type, said downlink transmission unit of a first type including a sequence of OFDM symbols including said strip OFDM symbol and a plurality of non-strip OFDM symbols, said step of generating a downlink transmission unit of the first type including:

selectively positioning said strip OFDM symbol at an OFDM symbol location in said sequence within said downlink transmission unit of the first type based upon a characteristic of a cell;

transmitting the downlink transmission unit; and

generating additional strip OFDM symbols, generating said strip OFDM symbol and said additional strip OFDM symbols including performing tone hopping in accordance with a second tone hopping sequence, said first and second tone hopping sequences being different and being applied independently during generation of said non-strip OFDM symbols and strip OFDM symbols, respectively, said strip OFDM symbols including said strip OFDM symbol and said additional strip OFDM symbols.

2. The communications method of claim 1 ,

wherein said method is implemented by a base station; and

wherein the characteristic of the cell is a cell identifier.

3. The communications method of claim 1 , further comprising:

generating, a downlink transmission unit of a second type, said downlink transmission unit of a second type including a plurality of non-strip OFDM symbols but no strip OFDM symbols.

4. The communications method of claim 3 , further comprising:

generating additional strip OFDM symbols; and

transmitting transmission units of the first type and transmission units of the second type according to a predetermined transmission schedule.

5. The communications method of claim 4 , wherein said predetermined transmission schedule corresponds to a superslot.

6. The communications method of claim 3 ,

wherein first coding and modulation is performed to generate strip OFDM symbols; and

wherein second coding and modulation is performed to generate non-strip OFDM symbols, the first coding and modulation being independent of the second coding and modulation.

7. The communications method of claim 6 , wherein transmission units of the first type and transmission units of the second type include the same number of non-strip OFDM symbols, each non-strip OFDM symbol including a plurality of tones.

8. The communications method of claim 7 , wherein tone hopping is performed in strip OFDM symbols using a tone hopping sequence which is independent of a tone hopping sequence used to in non-strip OFDM symbols.

9. The communications method of claim 6 , wherein downlink transmission units of the first type include more non-strip OFDM symbols than strip OFDM symbols.

10. The method of claim 1 , wherein said strip OFDM symbol includes multiple tones.

11. The method of claim 10 , where said non-strip OFDM symbols each include multiple tones.

12. The method of claim 10 , wherein said data unit of the first type includes more non-strip OFDM symbols than strip OFDM symbols.

13. The method of claim 12 , wherein said data unit of the first type includes only one strip OFDM symbol.

14. The method of claim 10 , wherein at least some of said non-strip OFDM symbols communicate traffic data.

15. The method of claim 13 , wherein said strip OFDM symbol communicates a beacon signal.

16. A communications device for generating downlink transmission units within a time division duplex (TDD) environment, comprising:

a strip symbol generator configured to generate a strip Orthogonal Frequency Division Multiplexing (OFDM) symbol;

a non-strip symbol generator configured to generate non-strip OFDM symbols using a first tone hopping sequence, tone hopping in said non-strip OFDM symbols being independent of said generation of said strip OFDM symbol;

wherein said strip symbol generator is further configured to generate additional strip OFDM symbols, said strip symbol generator being configured to perform tone hopping in accordance with a second tone hopping sequence as part of generating said strip OFDM symbol and said additional strip OFDM symbols, said first and second tone hopping sequences being different and being applied independently during generation of said non-strip OFDM symbols and strip OFDM symbols, respectively, said strip OFDM symbols including said strip OFDM symbol and said additional strip OFDM symbols, the communications e further comprising:

a downlink transmission unit generator for generating a downlink transmission unit of a first type, said downlink transmission unit of a first type including a sequence of OFDM symbols including said strip OFDM symbol and a plurality of non-strip OFDM symbols, said transmission unit generator including:

a strip symbol inserter for selectively positioning said strip OFDM symbol at an OFDM symbol location in said sequence within said downlink transmission unit of the first type based upon a characteristic of a cell; and

a transmitter for transmitting the downlink transmission unit.

17. The communications device of claim 16 ,

wherein said communications device is a base station.

18. The communications device of claim 16 , wherein said downlink transmission unit generator is further configured to:

generate a downlink transmission unit of a second type, said downlink transmission unit of a second type including a plurality of non-strip OFDM symbols but no strip OFDM symbols.

19. The communications device of claim 18 ,

wherein said strip symbol generator is further configured to generate additional strip OFDM symbols; and

wherein said transmitter is further configured to transmit transmission units of the first type and transmission units of the second type according to a predetermined transmission schedule.

20. A communications device for generating downlink transmission units within a time division duplex (TDD) environment, comprising:

means for generating a strip Orthogonal Frequency Division Multiplexing (OFDM) symbol and additional strip OFDM symbols;

means for generating non-strip OFDM symbols using a first tone hopping sequence, tone hopping in said non-strip OFDM symbols being independent of said generation of said strip OFDM symbol;

wherein said means for generating a strip OFDM symbol and additional strip OFDM symbols uses tone hopping performed in accordance with a second tone hopping sequence, said first and second tone hopping sequences being different and being applied independently during generation of said non-strip OFDM symbols and strip OFDM symbols, respectively, said strip OFDM symbols including said strip OFDM symbol and said additional strip OFDM symbols, the communications device further comprising:

means for generating a downlink transmission unit of a first type, said downlink transmission unit of a first type including a sequence of OFDM symbols including said strip OFDM symbol and a plurality of non-strip OFDM symbols, said means for generating a downlink transmission unit including:

means for selectively positioning said strip OFDM symbol at an OFDM symbol location in said sequence within said downlink transmission unit of the first type based upon a characteristic of a cell; and

means for transmitting the downlink transmission unit.

21. The communications device of claim 20 ,

wherein said communications device is a base station.

22. The communications device of claim 20 , further comprising:

means for generating a downlink transmission unit of a second type, said downlink transmission unit of a second type including a plurality of non-strip OFDM symbols but no strip OFDM symbols.

23. A non-transitory machine readable medium having stored thereon machine-executable instructions for controlling a communications device, said communications device being abuse station, the non-transitory machine readable medium comprising:

instructions for causing said communications device to generate strip Orthogonal Frequency Division Multiplexing (OFDM) symbols;

instructions for causing said communications device to generate non-strip OFDM symbols using a first tone hopping sequence, tone hopping in said non-strip OFDM symbols being independent of said generation of said strip OFDM symbol;

wherein said instructions for causing said communications device to generate strip OFDM symbols include instructions for performing tone hopping in accordance with a second tone hopping sequence as part of generating a strip OFDM symbol and additional strip OFDM symbols, said first and second tone hopping sequences being different and being applied independently during generation of said non-strip OFDM symbols and said strip OFDM symbols, respectively;

the non-transitory machine readable medium further comprising:

instructions for causing said communications device to generate a downlink transmission unit of a first type, said downlink transmission unit of a first type including a sequence of OFDM symbols including said strip OFDM symbol and a plurality of non-strip OFDM symbols;

instructions for causing said communications device to selectively position said strip OFDM symbol at an OFDM symbol location in said sequence within said downlink transmission unit of the first type based upon a characteristic of a cell; and

instructions for causing said communications device to transmit the downlink transmission unit.

24. A communications device, comprising:

a processor configured to control said communications device to:

generate a strip Orthogonal Frequency Division Multiplexing (OFDM) symbol;

generate non-strip OFDM symbols using a first tone hopping sequence, tone hopping in said non-strip OFDM symbols being independent of said generation of said strip OFDM symbol;

generate a downlink transmission unit of a first type, said downlink transmission unit of a first type including a sequence of OFDM symbols including said strip OFDM symbol and a plurality of non-strip OFDM symbols;

selectively position said strip OFDM symbol at an OFDM symbol location in said sequence within said downlink transmission unit of the first type based upon a characteristic of a cell; and

transmit the downlink transmission unit;

wherein said processor is further configured to generate additional strip OFDM symbols and perform tone hopping in accordance with a second tone hopping sequence, as part of generating said strip OFDM symbol, said first and second tone hopping sequences being different and being applied independently during generation of said non-strip OFDM symbols and strip OFDM symbols, respectively, said strip OFDM symbols including said strip OFDM symbol and said additional strip OFDM symbols; and

wherein the communications device further comprises a memory coupled to said processor.